* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

li {
    list-style: none;
}

#app {
    padding: 20px;
    box-shadow: 1px 2px 13px -1px #000;
}

button {
    background: skyblue;
    padding: 8px 10px;
    border: none;
    border-radius: 20px;
}